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PQR = 3X-55 ...(1)
PRQ+70 = 3X+25
PRQ = 3X-45 ...(2)
PRQ+PQR+70 = 180
3X-45+3X-55+70 = 180
6X = 210
3X = 105
X = 35
-------------------------------
PRQ = 3X-45
= 105-45 = 60° (D)
jadikan yang terbaik ya